#include<stdio.h>
int main ()
{
	int a,b;
	int c;
	while(scanf("%d %d",&a,&b)!=EOF)
	{
		if(a==0&&b==0)
		{
			break;
		}
		else
		{
			c=a+b;
			printf("%d",c);
		}
	}
	return 0;
}
